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Marc SerraultMS

Marc Serrault

Senior Backend & Data Engineer | Scalable Systems

€600/day
Vernon, FR
8-15 years
Python
Node.js
REST APIs
LLM
Analyse de données

Average response time: 1 hour

About Marc

Senior Software Engineer with 10+ years of experience in high-stakes environments (banking, industrial systems).

I specialize in designing and building robust, scalable backend and data systems, with a strong focus on performance, reliability, and observability. Recently, I have been working on AI-driven architectures (RAG, LLM integration).

I support companies across the full lifecycle

- System architecture & design
- Backend and data engineering
- Production deployment & scaling


Key expertise

- Backend architecture (microservices, APIs, distributed systems)
- Data engineering & large-scale processing
- Observability & monitoring at scale
- High-availability and fault-tolerant systems
- AI systems integration (RAG, LLM pipelines)


I focus on delivering production-ready systems that are maintainable and resilient.

  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • SYSNAV
    Senior Software Engineer
    June 2020 - March 2026 (5 years and 9 months)
    Vernon, France

    Data Engineering & Geospatial Processing

    - Designed and implemented geospatial data pipelines using Python, Pandas, and GeoPandas
    - Processed and analyzed telemetry data from a fleet of 200 vehicles (~60 GB/day)

    Observability & Large-Scale Monitoring

    - Deployed and operated an ELK stack ingesting ~1 TB of logs per day
    - Implemented real-time monitoring, proactive alerting, and improved incident detection

    Backend Architecture & APIs

    - Developed RESTful microservices using FastAPI and Flask
    - Built geospatial visualization interfaces using React and Leaflet
    Infrastructure & Industrialization
    - Automated deployments using Docker and Ansible
    - Managed configuration and standardized environments with Puppet
    - Embedded Systems & Mobile Development
    - Developed an Android application (Kotlin) for Bluetooth communication with embedded sensors

    Reliability & Operations

    - Ensured operational maintenance (MCO) of field-deployed systems
    - Continuously improved system availability, robustness, and resilience

    Technical Environment

    Python, Pandas, GeoPandas, ELK Stack, FastAPI, Flask, React, Leaflet, Docker, Ansible, Puppet, Kotlin, Bluetooth
    Python Elastic Stack (ELK) Ansible Node.js FastAPI
  • INFOTEL
    Tech Lead Blockchain | Mission Banque de France
    BANKING AND INSURANCE
    April 2017 - June 2020 (3 years and 2 months)
    Paris, France

    Leadership & Business Impact

    - Served as the sole technical lead for the MADRE project, the first interbank blockchain application in France
    - Led Agile delivery (Scrum) and successfully deployed the solution across 8 banking institutions

    Backend Architecture & Security

    - Designed a critical decentralized system operating with zero downtime
    - Developed Node.js APIs and Ethereum smart contracts (Solidity)
    - Implemented automated testing and enforced rigorous code audit practices

    Consulting & Knowledge Transfer

    - Conducted strategic technology watch and contributed to technical decision-making
    - Produced comprehensive architecture documentation and delivered technical training to partner banking teams

    Technical Environment

    Node.js, Ethereum, Solidity, Web3, AngularJS, Scrum
    Node.js Solidity Ethereum PostgreSQL
  • INFOTEL
    Java Developer | Mission Banque de France
    BANKING AND INSURANCE
    February 2013 - April 2017 (4 years and 2 months)
    Paris, France
    Worked within a team of 7 developers on Onegate, a critical platform for regulatory data collection and financial reporting.

    Application Redesign & Modernization

    - Contributed to the complete redesign of the platform, including migration to Java 8 (backend) and AngularJS (frontend)
    - Participated in technical and functional specifications, as well as workload estimation

    XBRL Expertise & Performance

    - Acted as the technical lead for financial taxonomies (XBRL)
    - Designed validation modules based on ANTLR
    - Optimized parser performance to handle large-scale data processing

    Security & Infrastructure

    - Implemented Kerberos authentication to secure platform access

    Performance & Operations

    - Tuned JVM performance, achieving significant memory consumption reduction
    - Ensured operational maintenance (MCO) of critical batch processing jobs

    Technical Environment

    Java 8, AngularJS, ANTLR, XBRL, Kerberos, JVM tuning
    Java XBRL
Check out Marc's experience

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Education

  • Master Informatique
    Université de Caen
    2010
    Master Informatique
  • Licence
    Université de Caen
    2008
    Licence

Skill set

Développement Back-End
PostgreSQL
Node.js
Python
LLM
Docker
Elastic Stack (ELK)
React.js
RAG
Ansible
API
Microservices

Categories